program: r0 = socket$inet6(0xa, 0x1, 0x100) r1 = socket$inet6_udp(0xa, 0x2, 0x0) r2 = socket$packet(0x11, 0x3, 0x300) mount$overlay(0x0, 0x0, 0x0, 0x0, &(0x7f0000000080)={[{@workdir={'workdir', 0x3d, './bus'}}, {@lowerdir={'lowerdir', 0x3d, './file0'}}]}) r3 = socket$unix(0x1, 0x5, 0x0) ioctl$sock_SIOCETHTOOL(0xffffffffffffffff, 0x8946, &(0x7f0000000080)={'virt_wifi0\x00', &(0x7f0000000040)=@ethtool_eeprom}) ioctl$sock_SIOCGIFINDEX_80211(0xffffffffffffffff, 0x8933, &(0x7f0000000080)={'wlan0\x00'}) ioctl$sock_proto_private(r3, 0x8b0b, &(0x7f0000000080)) ioctl$ifreq_SIOCGIFINDEX_batadv_mesh(r2, 0x8933, &(0x7f0000000080)={'batadv0\x00', 0x0}) sendto$packet(r2, &(0x7f0000000100)="f257a8ea7bc273dfaeab96850806", 0x2a, 0x0, &(0x7f0000000200)={0x11, 0x0, r4, 0x1, 0x0, 0x6, @link_local}, 0x14) setsockopt$inet6_mreq(r1, 0x29, 0x15, &(0x7f0000000040)={@mcast1, r4}, 0x14) bind$inet6(r0, &(0x7f00000000c0)={0xa, 0x4e21, 0xb, @empty}, 0x1c) connect$inet6(r0, &(0x7f0000000000)={0xa, 0x4e21, 0x0, @empty}, 0x1c) [ 69.019001][ T4674] Bluetooth: hci0: command tx timeout [ 69.083144][ T5326] warning: `syz.0.0' uses wireless extensions which will stop working for Wi-Fi 7 hardware; use nl80211 [ 69.095523][ T5326] [ 69.096587][ T5326] ====================================================== [ 69.099191][ T5326] WARNING: possible circular locking dependency detected [ 69.101808][ T5326] 6.15.0-rc1-syzkaller-00060-ga24588245776 #0 Not tainted [ 69.104500][ T5326] ------------------------------------------------------ [ 69.107143][ T5326] syz.0.0/5326 is trying to acquire lock: [ 69.109349][ T5326] ffffffff900fd3c8 (rtnl_mutex){+.+.}-{4:4}, at: smc_vlan_by_tcpsk+0x39b/0x4f0 [ 69.112877][ T5326] [ 69.112877][ T5326] but task is already holding lock: [ 69.115741][ T5326] ffff888053598258 (sk_lock-AF_INET6){+.+.}-{0:0}, at: smc_connect+0xb7/0xde0 [ 69.119117][ T5326] [ 69.119117][ T5326] which lock already depends on the new lock. [ 69.119117][ T5326] [ 69.123048][ T5326] [ 69.123048][ T5326] the existing dependency chain (in reverse order) is: [ 69.126343][ T5326] [ 69.126343][ T5326] -> #1 (sk_lock-AF_INET6){+.+.}-{0:0}: [ 69.129267][ T5326] lock_acquire+0x116/0x2f0 [ 69.131231][ T5326] lock_sock_nested+0x48/0x100 [ 69.133368][ T5326] do_ipv6_setsockopt+0xccd/0x3680 [ 69.135704][ T5326] ipv6_setsockopt+0x5d/0x170 [ 69.137812][ T5326] do_sock_setsockopt+0x3b1/0x710 [ 69.140011][ T5326] __x64_sys_setsockopt+0x1ee/0x280 [ 69.142285][ T5326] do_syscall_64+0xf3/0x230 [ 69.144318][ T5326] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 69.146871][ T5326] [ 69.146871][ T5326] -> #0 (rtnl_mutex){+.+.}-{4:4}: [ 69.149702][ T5326] validate_chain+0xa69/0x24e0 [ 69.151766][ T5326] __lock_acquire+0xad5/0xd80 [ 69.153833][ T5326] lock_acquire+0x116/0x2f0 [ 69.155763][ T5326] __mutex_lock+0x1a5/0x10c0 [ 69.157674][ T5326] smc_vlan_by_tcpsk+0x39b/0x4f0 [ 69.159794][ T5326] __smc_connect+0x296/0x1920 [ 69.161785][ T5326] smc_connect+0x868/0xde0 [ 69.163671][ T5326] __sys_connect+0x28c/0x2d0 [ 69.165707][ T5326] __x64_sys_connect+0x7a/0x90 [ 69.167759][ T5326] do_syscall_64+0xf3/0x230 [ 69.169719][ T5326] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 69.172318][ T5326] [ 69.172318][ T5326] other info that might help us debug this: [ 69.172318][ T5326] [ 69.176306][ T5326] Possible unsafe locking scenario: [ 69.176306][ T5326] [ 69.179192][ T5326] CPU0 CPU1 [ 69.181330][ T5326] ---- ---- [ 69.183518][ T5326] lock(sk_lock-AF_INET6); [ 69.185471][ T5326] lock(rtnl_mutex); [ 69.187996][ T5326] lock(sk_lock-AF_INET6); [ 69.190651][ T5326] lock(rtnl_mutex); [ 69.192331][ T5326] [ 69.192331][ T5326] *** DEADLOCK *** [ 69.192331][ T5326] [ 69.195448][ T5326] 1 lock held by syz.0.0/5326: [ 69.197393][ T5326] #0: ffff888053598258 (sk_lock-AF_INET6){+.+.}-{0:0}, at: smc_connect+0xb7/0xde0 [ 69.201080][ T5326] [ 69.201080][ T5326] stack backtrace: [ 69.203385][ T5326] CPU: 0 UID: 0 PID: 5326 Comm: syz.0.0 Not tainted 6.15.0-rc1-syzkaller-00060-ga24588245776 #0 PREEMPT(full) [ 69.203401][ T5326] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 69.203409][ T5326] Call Trace: [ 69.203416][ T5326] [ 69.203421][ T5326] dump_stack_lvl+0x241/0x360 [ 69.203442][ T5326] ? __pfx_dump_stack_lvl+0x10/0x10 [ 69.203458][ T5326] ? __pfx__printk+0x10/0x10 [ 69.203472][ T5326] ? print_lock+0x171/0x1a0 [ 69.203485][ T5326] print_circular_bug+0x2e1/0x300 [ 69.203498][ T5326] check_noncircular+0x142/0x160 [ 69.203512][ T5326] validate_chain+0xa69/0x24e0 [ 69.203529][ T5326] __lock_acquire+0xad5/0xd80 [ 69.203540][ T5326] lock_acquire+0x116/0x2f0 [ 69.203549][ T5326] ? smc_vlan_by_tcpsk+0x39b/0x4f0 [ 69.203565][ T5326] ? kasan_save_track+0x51/0x80 [ 69.203624][ T5326] __mutex_lock+0x1a5/0x10c0 [ 69.203637][ T5326] ? smc_vlan_by_tcpsk+0x39b/0x4f0 [ 69.203654][ T5326] ? smc_vlan_by_tcpsk+0x39b/0x4f0 [ 69.203673][ T5326] ? __pfx___mutex_lock+0x10/0x10 [ 69.203690][ T5326] smc_vlan_by_tcpsk+0x39b/0x4f0 [ 69.203704][ T5326] ? __pfx_smc_vlan_by_tcpsk+0x10/0x10 [ 69.203716][ T5326] ? __kmalloc_cache_noprof+0x236/0x370 [ 69.203730][ T5326] ? __smc_connect+0x1c7/0x1920 [ 69.203741][ T5326] __smc_connect+0x296/0x1920 [ 69.203753][ T5326] ? do_raw_spin_unlock+0x58/0x8b0 [ 69.203768][ T5326] smc_connect+0x868/0xde0 [ 69.203780][ T5326] __sys_connect+0x28c/0x2d0 [ 69.203796][ T5326] ? __pfx___sys_connect+0x10/0x10 [ 69.203815][ T5326] __x64_sys_connect+0x7a/0x90 [ 69.203828][ T5326] do_syscall_64+0xf3/0x230 [ 69.203840][ T5326] ? clear_bhb_loop+0x45/0xa0 [ 69.203852][ T5326] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 69.203863][ T5326] RIP: 0033:0x7fc85698d169 [ 69.203876][ T5326] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 [ 69.203885][ T5326] RSP: 002b:00007fc8577cb038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 69.203897][ T5326] RAX: ffffffffffffffda RBX: 00007fc856ba5fa0 RCX: 00007fc85698d169 [ 69.203906][ T5326] RDX: 000000000000001c RSI: 0000200000000000 RDI: 0000000000000003 [ 69.203913][ T5326] RBP: 00007fc856a0e2a0 R08: 0000000000000000 R09: 0000000000000000 [ 69.203921][ T5326] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 69.203928][ T5326] R13: 0000000000000000 R14: 00007fc856ba5fa0 R15: 00007fff7308c038 [ 69.203937][ T5326]